Power supply circuit and energy storage system

Abstract

The invention provides a power supply circuit and an energy storage system, and relates to the technical field of power electronics. The power supply circuit comprises a starting circuit of which the first end is connected with a direct current input source; the first end of the first switch piece is connected with the second end of the starting circuit; the first end of the capacitive component is connected with the second end of the first switch piece, and the second end of the capacitive component is grounded; the power supply end of the control chip is connected with the second end of the first switch piece, and the first output end of the control chip is used for transmitting a driving signal to the control end of the first switch piece; a primary winding of the transformer is connected with the direct current input source, and a secondary winding of the transformer is used for supplying power to a load. According to the invention, the starting circuit does not generate power consumption during normal output of the power supply circuit, so that the energy-saving performance of the power supply is improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a power supply circuit and an energy storage system. Background Art

[0002] With the development of new energy technology and energy storage, all systems require power supply, and the main topology of the power supply is the flyback power supply circuit.

[0003] In the related art, when the system is operating normally, the power supply needs to support the power supply. When the system maintains output, the power supply circuit is in a charged state for a long time, such as Figure 4 The voltage transmitted by the DC input source flows through the resistor component 401 and the unidirectional diode D45 as the startup circuit and is transmitted to the power supply pin 7 of the startup chip U2. During the startup stage and the standby stage, the circuit between the DC input source and the startup chip U2 is in a charged state for a long time. Therefore, the power supply circuit in the related art has the problem of energy waste caused by the startup circuit being charged. Summary of the invention

[0004] The present application aims to solve the problem of energy waste caused by power consumption generated by a power supply existing in the prior art or related art.

[0005] To this end, a first aspect of the present application proposes a power supply circuit.

[0006] A second aspect of the present application provides an energy storage system.

[0007] In view of this, according to the first aspect of the present application, a power supply circuit is proposed, including: a starting circuit, a first end of the starting circuit is connected to a DC input source; a first switch element, a first end of the first switch element is connected to a second end of the starting circuit; a capacitive component, a first end of the capacitive component is connected to a second end of the first switch element, and the second end of the capacitive component is grounded; a control chip, a power supply end of the control chip is connected to the second end of the first switch element, and a first output end of the control chip is used to transmit a drive signal to the control end of the first switch element, wherein when the drive signal is a first level signal, the first switch element is turned on, and when the drive signal is a second level signal, the first switch element is turned off; a transformer, a primary winding of the transformer is connected to the DC input source, and a secondary winding of the transformer is used to supply power to a load, wherein the second output end of the control chip is used to control the on-off state between the primary winding of the transformer and the DC input source.

[0008] In this technical solution, the power supply circuit also includes a starting circuit, which is connected between the output end of the DC input source and the first end of the first switch element. The second end of the first switch element is connected to the power supply end of the control chip through a capacitive component. The first output end of the control chip is electrically connected to the control end of the first switch element. The first output end of the control chip can transmit a driving signal to the control end of the first switch element, and the driving signal is used to drive the on and off state of the first switch element.

[0009] Specifically, the first switch is a low-level conductive switch. In the initial stage, the control chip is not powered on, and the first switch is in a conductive state. When the DC input source outputs a voltage, the output voltage is transmitted to the first switch through the startup circuit. The first switch transmits the voltage to the capacitive component to charge the capacitive component. When the capacitive component is charged to reach the startup voltage of the control chip, the voltage at the power supply end of the control chip reaches the startup voltage, and the control chip starts to operate. At this time, the control chip transmits a drive signal of a second level signal to the first switch through the first output end, and the control end of the first switch is cut off in response to the drive signal of the second level signal. At this time, the startup circuit is in a non-working state.

[0010] It should be noted that the total capacitance of the capacitive component is set according to the working time of the startup circuit, so that the time for the capacitive component to be charged by the voltage output by the DC input source to reach the startup voltage matches the working time of the startup circuit.

[0011] In this technical solution, the power supply circuit also includes a transformer, which includes an iron core, a primary winding and a secondary winding. The number of the primary winding is at least one, and the number of the secondary winding is also at least one. The on-off state between the primary winding of the transformer and the DC input source is controlled by the control chip, that is, the control chip can control whether the transformer is powered on.

[0012] In the technical solution of the present application, a first switch element and a capacitive component are arranged between the startup circuit and the control chip, and the first switch element is a switch element that is turned on in response to a first level signal and a second level signal, so that the voltage output by the power supply circuit in the startup phase can charge the capacitive component through the turned-on first switch element. When the capacitive component is charged to reach the startup voltage of the control chip, the first output end of the control chip automatically transmits a drive signal of the second level signal to the control end of the first switch element, thereby driving the first switch element to be cut off, so that the startup circuit and the DC input source are switched from the on state to the off state, so that the startup circuit does not generate power consumption when the power supply circuit is outputting normally, thereby improving the energy saving of the power supply.

[0013] In some technical schemes, optionally, the power supply circuit also includes: a standby control circuit, a first input terminal of the standby control circuit is connected to the first output terminal of the control chip, a second input terminal of the standby control circuit is used to receive a first control signal, and an output terminal of the standby control circuit is connected to the control terminal of the first switch element; wherein the standby control circuit is used to receive a second level signal output by the control chip for energy storage, and output a second level signal to the control terminal of the first switch element in response to the first control signal.

[0014] In this technical solution, the power supply circuit also includes a standby control circuit. When the power supply circuit is outputting normally, the standby control circuit stores energy through a super capacitor or a battery inside the standby control circuit. When the power supply circuit is in standby mode, the electric energy stored in the super capacitor or the battery is transmitted to the control end of the first switch element through a second level signal, so that the first switch element is in a cut-off state, thereby ensuring that the startup circuit does not generate power consumption when the power supply circuit is in standby mode.

[0015] Specifically, the first input terminal of the standby control circuit is used to receive the driving signal transmitted by the first output terminal of the control chip, and the voltage of the driving signal is stored in the internal super capacitor or battery. The second input terminal of the standby control circuit is used to receive the first control signal, which can be a signal transmitted by the host computer. The first control signal is used to notify the standby control circuit that it is in the standby state at this time. At this time, the super capacitor or battery inside the standby control circuit outputs a driving signal of the second level signal. Since the output terminal of the standby control circuit is connected to the control terminal of the first switch component, the standby control circuit can replace the control chip to transmit the driving signal of the second level signal to the control terminal of the first switch component, so that the first switch component is in the cut-off state.

[0016] It should be noted that when the power supply circuit exits the standby state, a second control signal is transmitted to the standby control circuit through the host computer to notify the standby control circuit that the power supply circuit stops standby, and the standby control circuit stops outputting a driving signal of the second level signal to the control end of the first switch element.

[0017] In the technical solution of the present application, a standby control circuit capable of storing energy is provided in the power supply circuit. When the power supply circuit outputs normally, the standby control circuit can store the electric energy output by the control chip. Thus, when the power supply circuit is in the standby state, after the control chip is powered off, the standby control circuit can replace the control chip to output a driving signal of the second level signal to the control end of the first switch element, so that when the power supply circuit is in the standby state, the startup circuit can generate no power consumption, thereby realizing zero-power standby of the power supply circuit.

[0018] In some technical schemes, optionally, the standby control circuit includes: a first capacitor, a first end of the first capacitor is electrically connected to the first output end of the control chip, and a second end of the first capacitor is grounded; a second switch element, a first end of the second switch element is connected to the first end of the first capacitor, and the second end of the second switch element is connected to the control end of the first switch element, and the control end of the second switch element is used to receive the first control signal.

[0019] In this technical solution, the standby control circuit includes a first capacitor and a second switch element, the two ends of the first capacitor are respectively connected between the first output terminal and the ground terminal of the control chip, and the first capacitor is used to store the voltage of the drive signal output by the first output terminal of the control chip.

[0020] In this technical solution, the standby control circuit also includes a second switch element, which is connected between the first end of the first capacitor and the control end of the first switch element. The control end of the second switch element controls the on-off state between the first capacitor and the control end of the first switch element in response to the first control signal.

[0021] Specifically, the first end of the first capacitor is the first input end of the standby control circuit, the second end of the second switch element is the output end of the standby control circuit, and the control end of the second switch element is the second input end of the standby control circuit.

[0022] In the technical solution of the present application, a first capacitor capable of storing energy and a second switch element are arranged in the standby control circuit. The first capacitor can store energy for the drive signal output from the first output terminal of the control chip, and the second switch element can control whether the first capacitor outputs the drive signal to the control terminal of the first switch element, so that the standby control circuit can control the on-off state of the first switch element when the power supply circuit is in the standby state, thereby realizing the zero-power standby function of the power supply circuit.

[0023] In some technical schemes, optionally, the standby control circuit also includes: a first diode, the positive electrode of the first diode is electrically connected to the first output terminal of the control chip, and the negative electrode of the first diode is connected to the first end of the first capacitor; a first resistor, the first end of the first resistor is connected to the control end of the second switch; a second resistor, the first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is used to receive the first control signal.

[0024] In this technical solution, the standby control circuit further includes a first diode, which is connected between the first output terminal of the control chip and the first end of the first capacitor, so that the first output terminal of the control chip and the first end of the first capacitor are unidirectionally conductive. When the first output terminal of the control chip outputs a driving signal of a second level signal, the driving signal can be transmitted to the first capacitor through the first diode for energy storage, and the transmission of the first output terminal of the control chip when the first capacitor is discharged is avoided, thereby improving the operating stability of the standby control circuit.

[0025] In this technical solution, a first resistor and a second resistor are further provided in the standby control circuit. The first resistor and the second resistor are connected in series to the control end of the second switch element. The first resistor and the second resistor are driving resistors of the second switch element. That is, the first control signal or the second control signal transmitted by the host computer is transmitted to the control end of the second switch element through the first resistor and the second resistor, thereby controlling the on-off state of the second switch element.

[0026] In the technical solution of the present application, a first diode is arranged between the first capacitor and the first output terminal of the control chip, and a first resistor and a second resistor are connected in series at the control terminal of the second switch element, thereby improving the operating stability of the standby control circuit, so that the standby control circuit can stably control the on-off state of the first switch element in the standby state of the power supply circuit.

[0027] In some technical solutions, optionally, the power supply circuit also includes: a second diode, the cathode of the second diode is connected to the control end of the first switch element, the anode of the second diode is electrically connected to the first output end of the control chip, and the anode of the second diode is connected to the output end of the standby control circuit.

[0028] In this technical solution, the power supply circuit also includes a second diode arranged at the control end of the first switch element, and the anode of the second diode is used to receive the drive signal, that is, the anode of the second diode is connected to the first output end of the control chip and to the output end of the standby control circuit, and the cathode of the second diode is connected to the control end of the first switch element. The second diode makes the drive signal transmitted to the first switch element unidirectional.

[0029] In the technical solution of the present application, a second unidirectionally conductive diode is connected to the control end of the first switch element. When the power supply circuit is in a continuous output state, the drive signal output by the first output end of the control chip can be transmitted to the control end of the first switch element through the second diode, and when the power supply circuit is in a standby state, the drive signal output by the standby control circuit can also be transmitted to the control end of the first switch element through the second diode, thereby improving the stability of controlling the on-off state of the first switch element.

[0030] In some technical schemes, optionally, the power supply circuit also includes: a third resistor, a first end of the third resistor is connected to the first output end of the control chip, and a second end of the third resistor is connected to the first input end of the control chip; a second capacitor, a first end of the second capacitor is connected to the second end of the third resistor, and a second end of the fifth capacitor is grounded; wherein the frequency of the drive signal is associated with the resistance value of the third resistor and the capacitance value of the second capacitor.

[0031] In this technical solution, the first output terminal of the control chip is used to output the driving signal of the first switch, and the third resistor and the second capacitor connected to the first input terminal of the control chip are used to determine the operating frequency of the control chip, that is, to determine the signal frequency of the driving signal output by the first control chip. By adjusting the resistance value of the third resistor in the power supply circuit and the capacitance value of the third capacitor, the signal frequency of the driving signal output by the control chip is adjusted.

[0032] In the technical solution of the present application, a third resistor and a second capacitor are arranged in the power supply circuit, and the third resistor and the second capacitor are arranged according to actual needs, so that the control chip can output a driving signal of a corresponding signal frequency.

[0033] In some technical solutions, optionally, the capacitive component includes: at least two third capacitors, and the at least two third capacitors are connected in parallel between the second end of the first switch element and the ground end.

[0034] In this technical solution, at least two third capacitors are arranged in parallel, and the parallel third capacitors are connected between the second end of the first switch element and the ground end. When the first switch element is in the on state, the voltage output by the DC input source first charges the at least two third capacitors, and after the voltage of the at least two third capacitors reaches the start-up voltage of the control chip, the control chip is powered on and transmits a driving signal of the second level signal to the control end of the first switch element to drive the first switch element to be disconnected.

[0035] In the technical solution of the present application, at least two third capacitors in parallel are arranged in the capacitive component. In the initial power-on stage of the power supply circuit, the at least two third capacitors in parallel need to be charged first. When the voltage of the at least two third capacitors reaches the charging voltage of the control chip, the control chip starts powering on and transmits a driving signal of the second level signal to the first switch element. The at least two third capacitors in parallel enable the control chip to delay powering on to control the first switch element, thereby improving the startup stability of the power supply circuit.

[0036] In some technical solutions, optionally, the driving circuit includes: at least two fourth resistors, at least two fourth resistors are connected in series between the DC input source and the first end of the first switch element; wherein the total resistance of the at least two fourth resistors ranges from 100KΩ to 200KΩ.

[0037] In this technical solution, the driving circuit includes at least two fourth resistors connected in series, and the at least two fourth resistors connected in series are connected in series between the output end of the DC input end and the first end of the first switch element, that is, the voltage output by the DC input source needs to be transmitted to the first switch element through at least two fourth resistors.

[0038] It should be noted that the total resistance of the at least two fourth resistors ranges from 100KΩ to 200KΩ, which is smaller than the resistance of the resistor in the start-up circuit in the prior art. During the time period when the start-up circuit is working, since the total resistance of the at least two fourth resistors in the start-up circuit is small, the response is faster during high-voltage startup and the requirements for low-voltage startup can be met.

[0039] In the technical solution of the present application, at least two fourth resistors connected in series are provided in the starting circuit, and the total resistance value range of the at least two fourth resistors is greater than or equal to 100KΩ and less than or equal to 200KΩ, so that the power supply can adapt to a wide input voltage range.

[0040] In some technical solutions, optionally, the power supply circuit further includes: a fourth capacitor, a first end of the fourth capacitor is connected to the first end of the primary winding of the transformer, and a second end of the fourth capacitor is grounded.

[0041] In the technical solution of the present application, the first end of the fourth capacitor is connected between the DC input source and the first end of the primary winding of the transformer, and the other end of the fourth capacitor is connected to the ground terminal. In the process of the voltage output by the DC input source being transmitted to the transformer, the fourth capacitor, as an input power source, can absorb the high-frequency spike pulses and input buffer energy of the main power circuit, thereby further improving the stability of the operation of the power supply circuit.

[0042] In some technical solutions, optionally, the power supply circuit also includes: a third switch element, a control end of the third switch element is electrically connected to the second output end of the control chip, a first end of the third switch element is connected to the second end of the primary winding of the transformer, and a second end of the third switch element is grounded.

[0043] In this technical solution, the third switch is used to control whether the primary winding of the transformer is connected to the output end of the DC input source. Specifically, the control end of the third switch is connected to the second output end of the control chip, and the second output end of the control chip is used to output a control signal to the third switch to control the on-off state of the third switch from the first end to the second end, wherein the first end of the third switch is connected to the second end of the primary winding of the transformer, and the first end of the third switch is grounded, that is, the third switch is controlled to be in the on state, then the primary winding and the DC input source form a loop, at this time, the primary winding of the transformer is powered on, and the third switch is controlled to be in the off state, then the loop between the primary winding and the DC input source is disconnected, and at this time, the primary winding of the transformer is in the off state.

[0044] It should be noted that the power supply end of the control chip is also connected to the secondary winding of the transformer, that is, the voltage signal output by the secondary winding of the transformer can power the control chip. After the power supply circuit is started, the start-up circuit is in an unpowered state, at which time, the power supply of the control chip is provided by the secondary winding of the transformer.

[0045] In the technical solution of the present application, a third switch element controlled by a control chip is provided between the primary winding of the transformer and the ground terminal, so that the controller chip can control whether the primary winding of the transformer is powered on through the third switch element.

[0046] In some technical schemes, optionally, the power supply circuit also includes: a fifth resistor, a first end of the fifth resistor is connected to the second output end of the control chip, and a second end of the fifth resistor is connected to the control end of the third switch element; a sixth resistor, a first end of the sixth resistor is connected to the control end of the third switch element, and a second end of the sixth resistor is connected to the second end of the third switch element.

[0047] In the technical solution of the present application, the power supply circuit also includes a fifth resistor and a sixth resistor. The fifth resistor is connected between the second output terminal of the control chip and the control terminal of the third switch element. The sixth resistor is connected between the control terminal of the third switch element and the ground terminal. The fifth resistor and the sixth resistor are driving resistors of the third switch element. By setting the fifth resistor and the sixth resistor, the driving stability of the third switch element can be guaranteed.

[0048] In some technical solutions, optionally, the power supply circuit also includes: a current sampling circuit, a sampling end of the current sampling circuit is connected to the second end of the third switch element, and an output end of the current sampling circuit is connected to the second input end of the control chip.

[0049] In the technical solution of the present application, a current sampling circuit is provided in the power supply circuit, and the sampling end of the current sampling circuit is connected between the third switch element and the ground end, and the output end of the current sampling circuit is connected to the second input end of the control chip, so that the control chip can continuously monitor the current value of the primary winding of the transformer for overcurrent.

[0050] In some technical schemes, optionally, the current sampling circuit includes: a seventh resistor, a first end of the seventh resistor is connected to the second input end of the control chip, and a second end of the seventh resistor is connected to the second end of the third switch element; an eighth resistor, a first end of the eighth resistor is connected to the second end of the third switch element, and a second end of the eighth resistor is grounded; a fifth capacitor, a first end of the fifth capacitor is connected to the first end of the seventh resistor, and a second end of the fifth capacitor is grounded.

[0051] In this technical solution, the current sampling circuit includes an eighth resistor as a sampling resistor, and a seventh resistor and a fifth capacitor constituting an RC (resistance-capacitance) filter circuit. By collecting the current sampling signal at the eighth resistor, the current sampling signal is filtered by the RC filter circuit composed of the seventh resistor and the fifth capacitor and then transmitted to the second output terminal of the control chip, thereby completing the current sampling. Specifically, the common end of the seventh resistor and the eighth resistor is the sampling end of the current sampling circuit, and the common end of the seventh resistor and the fifth capacitor is the output end of the current sampling circuit.

[0052] In the technical solution of the present application, an eighth resistor for sampling, and a seventh resistor and a fifth capacitor for filtering are provided in the current sampling circuit, thereby improving the accuracy of the control chip in collecting the current sampling signal.

[0053] In some technical solutions, optionally, the power supply circuit also includes: a voltage sampling circuit, a sampling end of the voltage sampling circuit is connected to the secondary winding of the transformer, and an output end of the voltage sampling circuit is connected to the third input end of the control chip.

[0054] In the technical solution of the present application, a voltage sampling circuit is also provided in the power supply circuit, and the sampling end of the voltage sampling circuit is connected to the secondary winding of the transformer, so as to sample the output voltage value of the transformer, so that the control chip can monitor the output voltage of the transformer.

[0055] According to the second aspect of the present application, an energy storage system is proposed, including: a battery pack, and a power supply circuit in any of the above technical solutions, and thus has all the beneficial technical effects of the power supply circuit in any of the above technical solutions, which will not be repeated here.

[0056] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] Figure 1 One of the circuit topology diagrams of a power supply circuit provided in some embodiments of the present application is shown;

[0059] Figure 2 A second circuit topology diagram of a power supply circuit provided in some embodiments of the present application is shown;

[0060] Figure 3 A structural block diagram of an energy storage system is shown in some embodiments of the present application;

[0061] Figure 4 The circuit topology diagram of the power supply circuit in the related art is shown.

[0062] Figure 1 , Figure 2 and Figure 4 The reference numerals are as follows:

[0063] 100 power supply circuit, 101 startup circuit, 102 capacitive component, 103 transformer, 104 standby control circuit, 105 current sampling circuit, 106 voltage sampling circuit, Input DC input source, Q1 first switch component, Q2 second switch component, Q3 third switch component, U1 control chip, TX core, 1031 primary winding, 1032 secondary winding, C1 first capacitor, C2 second capacitor, C3 third capacitor, C4 fourth capacitor, C5 fifth capacitor, C6 sixth capacitor, D1 first diode, D2 second diode, D3 third diode, D4 ​​fourth diode, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, R5 fifth resistor, R6 sixth resistor, R7 seventh resistor, R8 eighth resistor, R9 ninth resistor, R10 tenth resistor, R11 eleventh resistor, R12 twelfth resistor, U2 startup chip, 401 resistor component, D45 unidirectional diode. DETAILED DESCRIPTION

[0064] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, in the absence of conflict, the present embodiment and the features in the embodiment can be combined with each other.

[0065] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0066] Refer to the following Figures 1 to 3 A power supply circuit and an energy storage system according to some embodiments of the present application are described.

[0067] According to one embodiment of the present application, Figure 1 One of the circuit topology diagrams of a power supply circuit provided in some embodiments of the present application is shown. Figure 2 FIG. 2 shows a circuit topology diagram of a power supply circuit provided in some embodiments of the present application. Figure 1 and Figure 2 As shown, a power supply circuit 100 is proposed, including: a start-up circuit 101, a capacitive component 102, a control chip U1, a transformer 103 and a first switch element Q1. The first end of the start-up circuit 101 is connected to the DC input source Input; the first end of the first switch element Q1 is connected to the second end of the start-up circuit 101; the first end of the capacitive component 102 is connected to the second end of the first switch element Q1, and the second end of the capacitive component 102 is grounded; the power supply end of the control chip U1 is connected to the second end of the first switch element Q1, and the first output end of the control chip U1 is used to transmit a drive signal to the control end of the first switch element Q1, wherein when the drive signal is a first level signal, the first switch element Q1 is turned on, and when the drive signal is a second level signal, the first switch element Q1 is turned off; the primary winding 1031 of the transformer 103 is connected to the DC input source Input, and the secondary winding 1032 of the transformer 103 is used to supply power to the load, wherein the second output end of the control chip U1 is used to control the on-off state between the primary winding 1031 of the transformer 103 and the DC input source Input.

[0068] In this embodiment, the power supply circuit 100 also includes a startup circuit 101, which is connected between the output end of the DC input source Input and the first end of the first switch element Q1. The second end of the first switch element Q1 is connected to the power supply end of the control chip U1 through the capacitive component 102. The first output end of the control chip U1 is electrically connected to the control end of the first switch element Q1. The first output end of the control chip U1 can transmit a driving signal to the control end of the first switch element Q1, and the driving signal is used to drive the on and off state of the first switch element Q1.

[0069] like Figure 1 As shown, exemplarily, the power supply end of the control chip U1 is pin 8, pin 8 is the power supply pin of the control chip U1, the first output end of the control chip U1 is pin 1, and the second output end of the control chip U1 is pin 7.

[0070] Exemplarily, the first level signal is a low level signal, the second level signal is a high level signal, and the first switch element Q1 is a switch element that is turned on at a low level and turned off at a high level.

[0071] Specifically, the first switch Q1 is a low-level conductive switch. In the initial stage, the control chip U1 is not powered on, and the first switch Q1 is in a conductive state. When the DC input source Input outputs a voltage, the output voltage is transmitted to the first switch Q1 through the startup circuit 101. The first switch Q1 transmits the voltage to the capacitive component 102 to charge the capacitive component 102. When the capacitive component 102 is charged to reach the startup voltage of the control chip U1, the voltage at the power supply end of the control chip U1 reaches the startup voltage, and the control chip U1 starts to operate. At this time, the control chip U1 transmits a driving signal of a second level signal to the first switch Q1 through the first output end, and the control end of the first switch Q1 is cut off in response to the driving signal of the second level signal. At this time, the startup circuit 101 is in a non-operating state.

[0072] For example, Figure 1 Soft charge is the driving signal.

[0073] Exemplarily, the first switch element Q1 is a PNP type switch tube.

[0074] Exemplarily, the high-level driving signal transmitted by the control chip U1 to the first switch element Q1 is a 5V signal.

[0075] It should be noted that the total capacitance of the capacitive component 102 is set according to the working time of the startup circuit 101 so that the time for the capacitive component 102 to be charged by the voltage output by the DC input source Input to reach the startup voltage matches the working time of the startup circuit 101 .

[0076] In this embodiment, the power supply circuit 100 further includes a transformer 103, and the transformer 103 includes an iron core TX, a primary winding 1031, and a secondary winding 1032. The number of the primary winding 1031 is at least one, and the number of the secondary winding 1032 is also at least one. The on-off state between the primary winding 1031 of the transformer 103 and the DC input source Input is controlled by the control chip U1, that is, the control chip U1 can control whether the transformer 103 is powered on.

[0077] Exemplarily, the first level signal is a high level signal, the second level signal is a low level signal, and the first switch element Q1 is a switch element that is turned on at a high level and turned off at a low level.

[0078] like Figure 1 As shown, exemplarily, the number of primary windings 1031 is two windings connected in series, namely winding N1 and winding N2, and the number of secondary windings 1032 is three, namely winding N3, winding N4 and winding N5.

[0079] It should be noted that if Figure 4 As shown, in the related art, no circuit structure capable of controlling on and off is provided between the resistor component 401 and the startup chip U2. Therefore, no matter whether the power supply circuit is in a standby state or in a running state, the resistor component 401 and other circuits located between the startup chip U2 and the DC input source Input remain energized. Since the resistance value in the resistor component 401 is relatively large, power consumption is generated, which affects the energy saving of the power supply circuit.

[0080] In the embodiment of the present application, a first switch element Q1 and a capacitive component 102 are provided between the startup circuit 101 and the control chip U1, and the first switch element Q1 is a switch element that is turned on and off in response to a first level signal and a second level signal, so that the voltage output by the power supply circuit 100 in the startup phase can charge the capacitive component 102 through the turned-on first switch element Q1, and when the capacitive component 102 is charged to reach the startup voltage of the control chip U1, the first output end of the control chip U1 automatically transmits a driving signal of the second level signal to the control end of the first switch element Q1, thereby driving the first switch element Q1 to be turned off, so that the startup circuit 101 and the DC input source Input are switched from the on state to the off state, so that the startup circuit 101 does not generate power consumption when the power supply circuit 100 is outputting normally, thereby improving the energy saving performance of the power supply circuit 100.

[0081] In some embodiments, optionally, the power supply circuit 100 also includes: a standby control circuit 104, wherein a first input terminal of the standby control circuit 104 is connected to a first output terminal of the control chip U1, a second input terminal of the standby control circuit 104 is used to receive a first control signal, and an output terminal of the standby control circuit 104 is connected to a control terminal of the first switch element Q1; wherein the standby control circuit 104 is used to receive a second level signal output by the control chip U1 for energy storage, and output a second level signal to the control terminal of the first switch element Q1 in response to the first control signal.

[0082] In this embodiment, the power supply circuit 100 also includes a standby control circuit 104. When the power supply circuit 100 outputs normally, the standby control circuit 104 stores energy through a super capacitor or a battery inside the standby control circuit 104. When the power supply circuit 100 is in standby mode, the electric energy stored in the super capacitor or the battery is transmitted to the control end of the first switch element Q1 through a second level signal, so that the first switch element Q1 is in a cut-off state, thereby ensuring that when the power supply circuit 100 is in standby state, the startup circuit 101 does not generate power consumption.

[0083] Specifically, the first input terminal of the standby control circuit 104 is used to receive the driving signal transmitted by the first output terminal of the control chip U1, and store the voltage of the driving signal in the internal super capacitor or battery. The second input terminal of the standby control circuit 104 is used to receive the first control signal, which can be a signal transmitted by the host computer. The first control signal is used to notify the standby control circuit 104 that it is in the standby state at this time. At this time, the super capacitor or battery inside the standby control circuit 104 outputs a driving signal of a second level signal. Since the output terminal of the standby control circuit 104 is connected to the control terminal of the first switch component Q1, the standby control circuit 104 can replace the control chip U1 to transmit the driving signal of the second level signal to the control terminal of the first switch component Q1, so that the first switch component Q1 is in the cut-off state.

[0084] It should be noted that when the power supply circuit 100 exits the standby state, a second control signal is transmitted to the standby control circuit 104 through the host computer, notifying the standby control circuit 104 that the power supply circuit 100 stops standby, and the standby control circuit 104 stops outputting a driving signal of a second level signal to the control end of the first switch element Q1.

[0085] In an embodiment of the present application, a standby control circuit 104 capable of storing energy is provided in the power supply circuit 100. When the power supply circuit 100 outputs normally, the standby control circuit 104 can store the electric energy output by the control chip U1. Thus, when the power supply circuit 100 is in a standby state, after the control chip U1 is powered off, the standby control circuit 104 can replace the control chip U1 to output a driving signal of a second level signal to the control end of the first switch element Q1, so that when the power supply circuit 100 is in a standby state, the startup circuit 101 can generate no power consumption, thereby realizing zero-power standby of the power supply circuit 100.

[0086] In some embodiments, the standby control circuit 104 may optionally include: a first capacitor C1 and a second switch element Q2. The first end of the first capacitor C1 is electrically connected to the first output end of the control chip U1, and the second end of the first capacitor C1 is grounded; the first end of the second switch element Q2 is connected to the first end of the first capacitor C1, and the second end of the second switch element Q2 is connected to the control end of the first switch element Q1, and the control end of the second switch element Q2 is used to receive the first control signal.

[0087] In this embodiment, the standby control circuit 104 includes a first capacitor C1 and a second switch element Q2. The two ends of the first capacitor C1 are respectively connected between the first output terminal of the control chip U1 and the ground terminal. The first capacitor C1 is used to store the voltage of the drive signal output by the first output terminal of the control chip U1.

[0088] Exemplarily, the first capacitor C1 may be a super capacitor or an energy storage battery.

[0089] In this embodiment, the standby control circuit 104 also includes a second switch element Q2, which is connected between the first end of the first capacitor C1 and the control end of the first switch element Q1. The control end of the second switch element Q2 controls the on-off state between the first capacitor C1 and the control end of the first switch element Q1 in response to the first control signal.

[0090] Specifically, the first end of the first capacitor C1 is the first input end of the standby control circuit 104 , the second end of the second switch element Q2 is the output end of the standby control circuit 104 , and the control end of the second switch element Q2 is the second input end of the standby control circuit 104 .

[0091] Exemplarily, the second switch element Q2 may be a high-level conduction switch or a low-level conduction switch. For example, the second switch element Q2 may be a PNP switch tube or an NPN switch tube.

[0092] In an embodiment of the present application, a first capacitor C1 and a second switch element Q2 capable of storing energy are provided in the standby control circuit 104. The drive signal output from the first output terminal of the control chip U1 can be stored through the first capacitor C1, and the second switch element Q2 can control whether the first capacitor C1 outputs the drive signal to the control terminal of the first switch element Q1, so that the standby control circuit 104 can control the on and off state of the first switch element Q1 when the power supply circuit 100 is in the standby state, thereby realizing the zero-power standby function of the power supply circuit 100.

[0093] In some embodiments, optionally, the standby control circuit 104 further includes: a first diode D1, a first resistor R1, and a second resistor R2. The anode of the first diode D1 is electrically connected to the first output terminal of the control chip U1, and the cathode of the first diode D1 is connected to the first end of the first capacitor C1; the first end of the first resistor R1 is connected to the control end of the second switch Q2; the first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is used to receive the first control signal.

[0094] In this embodiment, the standby control circuit 104 further includes a first diode D1, which is connected between the first output terminal of the control chip U1 and the first end of the first capacitor C1, so that the first output terminal of the control chip U1 and the first end of the first capacitor C1 are unidirectionally conductive. When the first output terminal of the control chip U1 outputs a driving signal of a second level signal, the driving signal can be transmitted to the first capacitor C1 through the first diode D1 for energy storage, and the transmission of the first output terminal of the control chip U1 when the first capacitor C1 is discharged is avoided, thereby improving the operational stability of the standby control circuit 104.

[0095] In this embodiment, the standby control circuit 104 is further provided with a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 are connected in series to the control end of the second switch element Q2. The first resistor R1 and the second resistor R2 are driving resistors of the second switch element Q2, that is, the first control signal or the second control signal transmitted by the host computer is transmitted to the control end of the second switch element Q2 through the first resistor R1 and the second resistor R2, thereby controlling the on-off state of the second switch element Q2.

[0096] In the embodiment of the present application, a first diode D1 is provided between the first capacitor C1 and the first output terminal of the control chip U1, and a first resistor R1 and a second resistor R2 are connected in series at the control terminal of the second switch element Q2, thereby improving the operating stability of the standby control circuit 104, so that the standby control circuit 104 can stably control the on-off state of the first switch element Q1 in the standby state of the power supply circuit 100.

[0097] In some embodiments, optionally, the power supply circuit 100 further includes: a second diode D2, the cathode of the second diode D2 is connected to the control end of the first switch element Q1, the anode of the second diode D2 is electrically connected to the first output end of the control chip U1, and the anode of the second diode D2 is connected to the output end of the standby control circuit 104.

[0098] In this embodiment, the power supply circuit 100 also includes a second diode D2 arranged at the control end of the first switch element Q1, and the anode of the second diode D2 is used to receive the drive signal, that is, the anode of the second diode D2 is connected to the first output end of the control chip U1, and to the output end of the standby control circuit 104, and the cathode of the second diode D2 is connected to the control end of the first switch element Q1. The second diode D2 enables the drive signal transmitted to the first switch element Q1 to be unidirectionally conducted.

[0099] In the embodiment of the present application, a unidirectionally conductive second diode D2 is connected to the control end of the first switch element Q1. When the power supply circuit 100 is in a continuous output state, the drive signal output by the first output end of the control chip U1 can be transmitted to the control end of the first switch element Q1 through the second diode D2. When the power supply circuit 100 is in a standby state, the drive signal output by the standby control circuit 104 can also be transmitted to the control end of the first switch element Q1 through the second diode D2, thereby improving the stability of controlling the on-off state of the first switch element Q1.

[0100] In some embodiments, optionally, the power supply circuit 100 further includes: a third resistor R3 and a second capacitor C2. The first end of the third resistor R3 is connected to the first output end of the control chip U1, and the second end of the third resistor R3 is connected to the first input end of the control chip U1; a second capacitor C2, the first end of the second capacitor C2 is connected to the second end of the third resistor R3, and the second end of the second capacitor C2 is grounded; wherein the frequency of the driving signal is associated with the resistance value of the third resistor R3 and the capacitance value of the second capacitor C2.

[0101] In this embodiment, the first output terminal of the control chip U1 is used to output the driving signal of the first switch Q1, and the third resistor R3 and the second capacitor C2 connected to the first input terminal of the control chip U1 are used to determine the operating frequency of the control chip U1, that is, to determine the signal frequency of the driving signal output by the first control chip U1. By adjusting the resistance value of the third resistor R3 and the capacitance value of the third capacitor C3 in the power supply circuit 100, the signal frequency of the driving signal output by the control chip U1 is adjusted.

[0102] like Figure 1 As shown, pin 2 of the control chip U1 is the first input terminal of the control chip U1, pin 1 is the first output terminal of the control chip U1, the third resistor R3 is connected between pin 1 and pin 2, and the second capacitor C2 is connected between pin 2 and the ground terminal.

[0103] In the embodiment of the present application, by setting a third resistor R3 and a second capacitor C2 in the power supply circuit 100 and setting the third resistor R3 and the second capacitor C2 according to actual needs, the control chip U1 can output a driving signal of a corresponding signal frequency.

[0104] In some embodiments, optionally, the capacitive component 102 includes: at least two third capacitors C3, and the at least two third capacitors C3 are connected in parallel between the second end of the first switch element Q1 and the ground end.

[0105] In this embodiment, at least two third capacitors C3 are arranged in parallel, and the third capacitors C3 connected in parallel are connected between the second end of the first switch element Q1 and the ground end. When the first switch element Q1 is in the on state, the voltage output by the DC input source Input first charges the at least two third capacitors C3. After the voltage of the at least two third capacitors C3 reaches the start-up voltage of the control chip U1, the control chip U1 is powered on and transmits a driving signal of a second level signal to the control end of the first switch element Q1 to drive the first switch element Q1 to be turned off.

[0106] like Figure 1 As shown, exemplarily, at least two third capacitors C3 include an electrolytic capacitor and at least two filter capacitors, the electrolytic capacitor is connected in series between the second end of the first switch element Q1 and the ground terminal, and at least two filter capacitors are connected in parallel with the electrolytic capacitor, and the common end of the electrolytic capacitor and the first switch element Q1 is connected to pin 8 of the control chip U1.

[0107] In the embodiment of the present application, at least two third capacitors C3 connected in parallel are arranged in the capacitive component 102. In the initial power-on stage of the power supply circuit 100, it is necessary to charge the at least two third capacitors C3 connected in parallel first. When the voltage of the at least two third capacitors C3 reaches the charging voltage of the control chip U1, the control chip U1 starts to power on and transmits a driving signal of a second level signal to the first switch element Q1. The at least two third capacitors C3 connected in parallel enable the control chip U1 to delay power-on to control the first switch element Q1, thereby improving the startup stability of the power supply circuit 100.

[0108] In some embodiments, optionally, the driving circuit includes: at least two fourth resistors R4, at least two fourth resistors R4 are connected in series between the DC input source Input and the first end of the first switch element Q1; wherein the total resistance of the at least two fourth resistors R4 ranges from 100KΩ to 200KΩ.

[0109] In this embodiment, the driving circuit includes at least two fourth resistors R4 connected in series, and the at least two fourth resistors R4 connected in series are connected in series between the output end of the DC input end and the first end of the first switch element Q1, that is, the voltage output by the DC input source Input needs to be transmitted to the first switch element Q1 through at least two fourth resistors R4.

[0110] It should be noted that the total resistance of the at least two fourth resistors R4 ranges from 100KΩ to 200KΩ, which is smaller than the resistance of the resistor in the start-up circuit 101 in the prior art. During the working period of the start-up circuit 101, since the total resistance of the at least two fourth resistors R4 in the start-up circuit 101 is small, the response is faster during high-voltage startup and the requirements of low-voltage startup can be met.

[0111] Exemplarily, the total resistance of the at least two fourth resistors R4 is selected to be 100 KΩ.

[0112] In the embodiment of the present application, at least two fourth resistors R4 connected in series are provided in the startup circuit 101, and the total resistance value range of the at least two fourth resistors R4 is greater than or equal to 100KΩ and less than or equal to 200KΩ, so that the power supply can adapt to a wide input voltage range.

[0113] In some embodiments, optionally, the power supply circuit 100 further includes: a fourth capacitor C4, a first end of the fourth capacitor C4 is connected to a first end of the primary winding 1031 of the transformer 103, and a second end of the fourth capacitor C4 is grounded.

[0114] In the embodiment of the present application, the first end of the fourth capacitor C4 is connected between the DC input source Input and the first end of the primary winding 1031 of the transformer 103, and the other end of the fourth capacitor C4 is connected to the ground end. In the process of the voltage output by the DC input source Input being transmitted to the transformer 103, the fourth capacitor C4, as an input power source, can absorb the high-frequency peak pulses and input buffer energy of the main power circuit, thereby further improving the stability of the operation of the power supply circuit 100.

[0115] In some embodiments, optionally, the power supply circuit 100 also includes: a third switch element Q3, the control end of the third switch element Q3 is electrically connected to the second output end of the control chip U1, the first end of the third switch element Q3 is connected to the second end of the primary winding 1031 of the transformer 103, and the second end of the third switch element Q3 is grounded.

[0116] In this embodiment, the third switch element Q3 is used to control whether the primary winding 1031 of the transformer 103 is connected to the output end of the DC input source Input. Specifically, the control end of the third switch element Q3 is connected to the second output end of the control chip U1, and the second output end of the control chip U1 is used to output a control signal to the third switch element Q3 to control the on-off state of the third switch element Q3 from the first end to the second end, wherein the first end of the third switch element Q3 is connected to the second end of the primary winding 1031 of the transformer 103, and the first end of the third switch element Q3 is grounded, that is, the third switch element Q3 is controlled to be in the on state, then the primary winding 1031 and the DC input source Input form a loop, at this time, the primary winding 1031 of the transformer 103 is powered on, and the third switch element Q3 is controlled to be in the off state, then the loop between the primary winding 1031 and the DC input source Input is disconnected, and at this time, the primary winding 1031 of the transformer 103 is in the off state.

[0117] like Figure 1As shown, exemplarily, the third switch element Q3 is selected as a MOS (Metal-Oxide-Semiconductor, metal-oxide semiconductor field effect transistor) switch, the D (drain) electrode of the MOS switch is connected to the second end line of the primary winding 1031 of the transformer 103, the S (source) electrode of the MOS switch is grounded, and the G (gate) electrode of the MOS switch is connected to pin 7 of the control chip U1.

[0118] It should be noted that the power supply end of the control chip U1 is also connected to the secondary winding 1032 of the transformer 103, that is, the voltage signal output by the secondary winding 1032 of the transformer 103 can power the control chip U1. After the power supply circuit 100 is started, the start-up circuit 101 is in a non-powered state. At this time, the power supply of the control chip U1 is provided by the secondary winding 1032 of the transformer 103.

[0119] like Figure 1 As shown, illustratively, the +12V power supply signal output by the secondary winding 1032 is transmitted to the pin 8 of the control chip U1 through the third diode D3 to power the control chip U1. The output end of the secondary winding 1032 is connected to two fourth diodes D4 connected in parallel, the positive poles of the two fourth diodes D4 are connected to the secondary winding 1032, and the negative poles of the two fourth diodes D4 are used to output the +12V power supply signal. A sixth capacitor C6 is connected between the second ends of the two fourth diodes D4 and the ground end.

[0120] In the embodiment of the present application, a third switch element Q3 controlled by the control chip U1 is provided between the primary winding 1031 of the transformer 103 and the ground terminal, so that the controller chip can control whether the primary winding 1031 of the transformer 103 is powered on through the third switch element Q3.

[0121] In some embodiments, optionally, the power supply circuit 100 further includes: a fifth resistor R5 and a sixth resistor R6. A first end of the fifth resistor R5 is connected to the second output end of the control chip U1, and a second end of the fifth resistor R5 is connected to the control end of the third switch element Q3; a first end of the sixth resistor R6 is connected to the control end of the third switch element Q3, and a second end of the sixth resistor R6 is connected to the second end of the third switch element Q3.

[0122] In the embodiment of the present application, the power supply circuit 100 also includes a fifth resistor R5 and a sixth resistor R6. The fifth resistor R5 is connected between the second output terminal of the control chip U1 and the control terminal of the third switch element Q3. The sixth resistor R6 is connected between the control terminal of the third switch element Q3 and the ground terminal. The fifth resistor R5 and the sixth resistor R6 are driving resistors of the third switch element Q3. By setting the fifth resistor R5 and the sixth resistor R6, the driving stability of the third switch element Q3 can be guaranteed.

[0123] In some embodiments, optionally, the power supply circuit 100 further includes: a current sampling circuit 105, wherein the sampling end of the current sampling circuit 105 is connected to the second end of the third switch element Q3, and the output end of the current sampling circuit 105 is connected to the second input end of the control chip U1.

[0124] In the embodiment of the present application, a current sampling circuit 105 is provided in the power supply circuit 100, and a sampling end of the current sampling circuit 105 is connected between the third switch element Q3 and the ground end, and an output end of the current sampling circuit 105 is connected to a second input end of the control chip U1, so that the control chip U1 can continuously perform overcurrent monitoring on the current value of the primary winding 1031 of the transformer 103.

[0125] In some embodiments, optionally, the current sampling circuit 105 includes: a seventh resistor R7, an eighth resistor R8 and a fifth capacitor C5. The first end of the seventh resistor R7 is connected to the second input end of the control chip U1, and the second end of the seventh resistor R7 is connected to the second end of the third switch Q3; the first end of the eighth resistor R8 is connected to the second end of the third switch Q3, and the second end of the eighth resistor R8 is grounded; the first end of the fifth capacitor C5 is connected to the first end of the seventh resistor R7, and the second end of the fifth capacitor C5 is grounded.

[0126] In this embodiment, the current sampling circuit 105 includes an eighth resistor R8 as a sampling resistor, and a seventh resistor R7 and a fifth capacitor C5 constituting an RC (resistance-capacitance) filter circuit. By collecting the current sampling signal at the eighth resistor R8, the current sampling signal is filtered by the RC filter circuit composed of the seventh resistor R7 and the fifth capacitor C5 and then transmitted to the second output terminal of the control chip U1, thereby completing the current sampling. Specifically, the common end of the seventh resistor R7 and the eighth resistor R8 is the sampling end of the current sampling circuit 105, and the common end of the seventh resistor R7 and the fifth capacitor C5 is the output end of the current sampling circuit 105.

[0127] like Figure 1 As shown, exemplarily, pin 6 of the control chip U1 serves as the second input terminal of the control chip U1 , and pin 6 of the control chip U1 is connected to the output terminal of the current sampling circuit 105 for receiving the current sampling value.

[0128] In the embodiment of the present application, an eighth resistor R8 for sampling, a seventh resistor R7 and a fifth capacitor C5 for filtering are provided in the current sampling circuit 105, which improves the accuracy of the control chip U1 in collecting the current sampling signal.

[0129] In some embodiments, optionally, the power supply circuit 100 further includes: a voltage sampling circuit 106, wherein the sampling end of the voltage sampling circuit 106 is connected to the secondary winding 1032 of the transformer 103, and the output end of the voltage sampling circuit 106 is connected to the third input end of the control chip U1.

[0130] In the embodiment of the present application, a voltage sampling circuit 106 is also provided in the power supply circuit 100, and the sampling end of the voltage sampling circuit 106 is connected to the secondary winding 1032 of the transformer 103, so as to sample the output voltage value of the transformer 103, so that the control chip U1 can monitor the output voltage of the transformer 103.

[0131] like Figure 1 As shown, exemplarily, the voltage sampling circuit 106 includes an eleventh resistor R11 and a twelfth resistor R12, the first end of the eleventh resistor R11 is connected to the output end of the secondary winding 1032 as the sampling end of the voltage sampling circuit 106, the second end of the eleventh resistor R11 is connected to the third input end of the control chip U1 as the output end of the voltage sampling circuit 106, the twelfth resistor R12 is connected between the second end of the eleventh resistor R11 and the ground end, wherein the pin 5 of the control chip U1 is used as the third input end.

[0132] In some embodiments, optionally, the power supply circuit 100 also includes a ninth resistor R9 and a tenth resistor R10, the first end of the tenth resistor R10 is connected to the first end of the first switch element Q1, the second end of the tenth resistor R10 is connected to the control end of the first switch element Q1, the first end of the ninth resistor R9 is connected to the control end of the first switch element Q1, and the second end of the ninth resistor R9 is connected to the ground end.

[0133] In the embodiment of the present application, the ninth resistor R9 and the tenth resistor R10 are driving resistors of the first switch element Q1 , and the ninth resistor R9 and the tenth resistor R10 can drive the first switch element Q1 to be stably turned on and off.

[0134] According to one embodiment of the present application, Figure 3 A structural block diagram of an energy storage system is shown in some embodiments of the present application. Figure 3 As shown, the energy storage system 200 includes: a battery pack 202, and the power supply circuit 100 in any of the above embodiments, and thus has all the beneficial technical effects of the power supply circuit 100 in any of the above embodiments, which will not be repeated here.

[0135] Exemplarily, the energy storage system 200 is connected to a photovoltaic module, and the electric energy in the photovoltaic module can be stored in a battery pack 202 in the energy storage system, and the battery pack serves as a DC input source Input in the power supply circuit 100 .

[0136] It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0137] In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, specification and drawings of the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0138] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: include: A starting circuit, wherein a first end of the starting circuit is connected to a DC input source; a first switch element, wherein a first end of the first switch element is connected to a second end of the start-up circuit; a capacitive component, wherein a first end of the capacitive component is connected to a second end of the first switch element, and a second end of the capacitive component is grounded; a control chip, wherein a power supply end of the control chip is connected to the second end of the first switch element, and a first output end of the control chip is used to transmit a drive signal to the control end of the first switch element, wherein when the drive signal is a first level signal, the first switch element is turned on, and when the drive signal is a second level signal, the first switch element is turned off; A transformer, wherein the primary winding of the transformer is connected to the DC input source, and the secondary winding of the transformer is used to supply power to a load, wherein the second output end of the control chip is used to control the on-off state between the primary winding of the transformer and the DC input source.

2. The power supply circuit according to claim 1, characterized in that: Also includes; A standby control circuit, wherein a first input terminal of the standby control circuit is connected to a first output terminal of the control chip, a second input terminal of the standby control circuit is used to receive a first control signal, and an output terminal of the standby control circuit is connected to a control terminal of the first switch element; The standby control circuit is used to receive the second level signal output by the control chip to store energy, and output the second level signal to the control end of the first switch element in response to the first control signal.

3. The power supply circuit according to claim 2, characterized in that: The standby control circuit comprises: A first capacitor, wherein a first end of the first capacitor is electrically connected to a first output end of the control chip, and a second end of the first capacitor is grounded; A second switch element, wherein a first end of the second switch element is connected to a first end of the first capacitor, a second end of the second switch element is connected to a control end of the first switch element, and the control end of the second switch element is used to receive the first control signal.

4. The power supply circuit according to claim 3, characterized in that: The standby control circuit further includes: a first diode, wherein an anode of the first diode is electrically connected to a first output terminal of the control chip, and a cathode of the first diode is connected to a first end of the first capacitor; a first resistor, wherein a first end of the first resistor is connected to a control end of the second switch; A second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor, and the second end of the second resistor is used to receive the first control signal.

5. The power supply circuit according to any one of claims 2 to 4, characterized in that: Also includes: A second diode, wherein the cathode of the second diode is connected to the control end of the first switch element, the anode of the second diode is electrically connected to the first output end of the control chip, and the anode of the second diode is connected to the output end of the standby control circuit.

6. The power supply circuit according to any one of claims 2 to 4, characterized in that: The power supply circuit also includes: a third resistor, wherein a first end of the third resistor is connected to the first output end of the control chip, and a second end of the third resistor is connected to the first input end of the control chip; a second capacitor, wherein a first end of the second capacitor is connected to a second end of the third resistor, and a second end of the second capacitor is grounded; The frequency of the driving signal is associated with the resistance of the third resistor and the capacitance of the second capacitor.

7. The power supply circuit according to any one of claims 1 to 4, characterized in that: The capacitive component comprises: At least two third capacitors are connected in parallel between the second end of the first switch element and the ground end.

8. The power supply circuit according to any one of claims 1 to 4, characterized in that: The power supply circuit comprises: At least two fourth resistors, wherein at least two of the fourth resistors are connected in series between the DC input source and the first end of the first switch element; Wherein, the total resistance of at least two of the fourth resistors ranges from 100KΩ to 200KΩ.

9. The power supply circuit according to any one of claims 1 to 4, characterized in that: Also includes: A fourth capacitor, wherein a first end of the fourth capacitor is connected to a first end of the primary winding of the transformer, and a second end of the fourth capacitor is grounded.

10. The power supply circuit according to any one of claims 1 to 4, characterized in that: Also includes: A third switch element, wherein a control end of the third switch element is electrically connected to the second output end of the control chip, a first end of the third switch element is connected to the second end of the primary winding of the transformer, and a second end of the third switch element is grounded.

11. The power supply circuit according to claim 10, characterized in that: Also includes: a fifth resistor, wherein a first end of the fifth resistor is connected to the second output end of the control chip, and a second end of the fifth resistor is connected to the control end of the third switch; A sixth resistor, wherein a first end of the sixth resistor is connected to the control end of the third switch element, and a second end of the sixth resistor is connected to the second end of the third switch element.

12. The power supply circuit according to claim 10, characterized in that: Also includes: A current sampling circuit, wherein a sampling end of the current sampling circuit is connected to the second end of the third switch element, and an output end of the current sampling circuit is connected to the second input end of the control chip.

13. The power supply circuit according to claim 12, characterized in that: The current sampling circuit comprises: a seventh resistor, wherein a first end of the seventh resistor is connected to the second input end of the control chip, and a second end of the seventh resistor is connected to the second end of the third switch element; an eighth resistor, a first end of the eighth resistor being connected to the second end of the third switch element, and a second end of the eighth resistor being grounded; A fifth capacitor, wherein a first end of the fifth capacitor is connected to a first end of the seventh resistor, and a second end of the fifth capacitor is grounded.

14. The power supply circuit according to any one of claims 1 to 4, characterized in that: Also includes: A voltage sampling circuit, wherein a sampling end of the voltage sampling circuit is connected to the secondary winding of the transformer, and an output end of the voltage sampling circuit is connected to the third input end of the control chip.

15. An energy storage system, characterized in that: include: Battery pack; The power supply circuit according to any one of claims 1 to 14, wherein the startup circuit of the power supply circuit is connected to the DC input source.

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